Is your concern that native is not a keyword in the specification and should only be allowed in the core library?

@codefu: Correct.

Are all dart:<lib> included in the 'core' hierarchy? If so, is there a solution beyond changing every #library('xyz') to #library('dart:xyz') that you see?

Sorry, you can use the native keyword in any platform library. It is not restricted to the core library.

I don't think you need to change the #library tags. The compiler needs to know what libraries are platform libraries. I should not be able to use native keyword just because I start my file with:

#library('dart:I_want_native');

We can certainly test to see if the unit is a dart URI before running the scanner. DartBoard is currently using the 'native' feature, so we may have to de-prioritize this till it can be updated. Thanks for submitting this as a tracker.

Set owner to @scheglov.
Added Accepted label.

https://code.google.com/p/dart/source/detail?r=4361

Added Fixed label.